First time using Blender: Receiving error message

Blender can be finnicky about using add-ons with different versions than the add-on was made for. Since that add-on is for 2.70, I'd suggest dling that version and trying it out again with that. Here's where you can grab older versions of Blender, since they've sort of hidden it away a little on their website. Personally, I tend to keep the latest version of Blender installed but download the .zip version of 2.70 so that I can have both on hand but it's up to you!